it's been has been 麻烦告诉一下 been 的语法,一般用在哪里?怎么用?

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• been a pleasure and honor to serve my country.It's been到用法是美式到还是英式到?还是说通用?同时想问一下考研英语的长难句用那些辅导教材好?最好找到当当到地址谢谢.第四楼明显在做广告……这点语法知识我还不懂吗?高中我英语可是全校最好的分子之一,别再吹了.不过对于课本以外的英语知识,特别是一下地方语言用法不懂.不过还是感谢你告诉我It's been=it has been.我还没见过这样子的写法.
• whom has the letter been sent ?sent后面要填一个介词怎么填?如果可以的话把填完后的句子结构和这里牵涉到的语法说明一下.谢了!这里为什么用whom而不用who
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• 麻烦帮我检查一下,这里的英语时态有没有错误,谢谢!再帮我写上以下16种时态分别的用法（就是他们的意思=在什么情况下用）,最好用你们自己理解的方式来告诉我,因为书本上写得太规范僵硬,我不太容易理解一般现在时：do现在完成时：have/has done现在进行时：be doing 现在完成进行时：have/has been doing一般过去时：did过去完成时：had done过去进行时：were/was doing过去完成进行时：had been doing一般将来时：shall/will do将来完成时：shall/will have done将来进行时：shall/will be doing将来完成进行时：shall/will have been doing一般过去将来时:should/would do过去将来完成时：should/would have done过去将来进行时:should/would be doing过去将来完成进行时：should/would have been doing
• it's been has been 麻烦告诉一下 been 的语法,一般用在哪里?怎么用?
• 请问一下I have been to shanghaiI have been to shanghai还原成一般现在时怎么还?如果been对应是的am I am to shanghai又错在哪?谁知道的,麻烦告诉一声,谢谢?
• it's been has been 麻烦告诉一下 been 的语法,一般用在哪里?怎么用?
• 分别由四个不同音调的字组成的四字词语
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